exostosis

An outgrowth from the surface of a bone, usually in response to inflammation or repeated trauma. The commonest form of exostosis is the bunion caused by abnormal local pressure from unsuitable footwear.

exostosis

cartilage-capped bony projection

ex·os·to·sis

, pl. exostoses (eks'os-tō'sis, -sēz)

Cartilage-capped bony projection arising from any bone that develops from cartilage.

[exo- + G. osteon, bone, + -osis, condition]

exostosis (pl. exostoses) (ek´sos-tō´sis),

n (hyperostosis) a bony growth projecting from a bony surface.

Mandibular tori exostosis.

exostosis

pl. exostoses [Gr.] a benign new growth projecting from a bone surface and characteristically capped by cartilage.

exostosis cartilaginea

a variety of osteoma consisting of a layer of cartilage developing beneath the periosteum of a bone.

inherited multiple exostosis

a benign hereditary disorder in horses. The lesions are visible externally but appear to cause little inconvenience. Similar to multiple cartilaginous exostoses (see below) in dogs and cats.

multiple cartilaginous e's

multiple bony exostoses in bones formed by enchondral ossification are seen in young dogs, usually on vertebrae, ribs and long bones. Adult cats are infrequently affected, and mainly on cranial bones. The bony enlargements are painless, but may cause musculoskeletal or neurological dysfunction. Neoplastic transformation has been reported. An hereditary basis is suspected in dogs. Called also diaphyseal aclasis, metaphyseal aclasis, osteochondromatosis, and in horses, inherited multiple exostosis (see above). See also osteophyte.

periarticular exostosis

occurs in any joint injury, commencing as cartilaginous osteophytes within a few days of the injury occurring.

BPOP, or Nora's lesion, so named for the lead physician who described the process in 1983, is a rare benign condition of locally aggressive and often recurrent osteochondromatous exostosis arising from the bony cortex.

The causes of brachial plexus palsy are obstetrical brachial plexus palsy, familial congenital brachial plexus palsy, maternal uterine malformation, congenital varicella syndrome, osteomyelitis involving the proximal head of the humerus or cervical vertebral bodies, exostosis of the first rib, tumors and hemangioma in the region of the brachial plexus, and intrauterine maladaptation.

He suffers from a rare condition called Multiple Congenital Cartilaginous Exostosis and says he has been enrolled with 12 others in a compassionate-care program that allows treatment with government-grown marijuana from The University of Mississippi.

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